Molding apparatus.



M. J. PIGNARRE. MOLDING APPARATUS.

APPLIOATION FILED MAB. s, 1907,

Patented Jllly, 1909.`

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M. J. PIGNARRE. MOLDING APPARATUS.

APPLICATION FILED MAR. 8, 1907. 926,893, Patented July 6, 1909.

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MOLDING APPARATUS.

APPLICATION FILED MAR* s, 1907.

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M. J. PIGNARRB.

MOLDING APPARATUS.

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UNITED STATES MARIE JOSEPH PIGNARRE, OF LIEGE, BELGIUM.

MOLDING APPARATUS.

Specification of Letters Patent.

Application filed March 8, 1907.

Patented July 6, 1909.

Serial No. 361,402.

T 0 all whom it may concern:

Be it known that I, MARIE JosnPH PIG- NARRE, a subject of the King ofBelgium, residing at Liege, Belgium, have invented certain new anduseful Improvements in Molding Apparatus; and l do hereby declare thefollowing to be a full, clear, and exact de scription ol the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the .letters or iigures of reference marked thereon, which form apart of this specification.

The present invention relates to an apparatus for the preparation ofsand molds and cores for cylindrical and similar castings. In suchdevice it is essential to provide a mold or a core perfectly straight,all parts of which are quite concentric with one another and at the sametime to provide for a complete homogeneity in the compression of sand inall parts of the mold or core.

The object of this invention is to use models and core boxes of shapeand size exactly the same as those of the molds and cores to beprepared, together with a tubular compressor holder revolvinghorizontally around the model or lantern which it surrounds, saidcompressor holder pressing the sand only by its own weight and risingalong the fixed model or lantern, by means of the screw shaped underface of compressors, rising and pressing on the sand automatically fedthere before.

The object of this invention is to dispense with models of reducedlength, following the rising movement of the compressors and with thealternating axial movement which such compressors usually receive, whichconstructions produce irregular results.

The following description has reference to the appended drawings,wherein like numbers oi' reference relier to like parts in all iigures,and whereinm Figure l is a cross sectional elevation showing theapparatus mounted on a vertical :frame wherein the model of the tube tobe molded is centered the socket end downward, the hall' section on theleft showing a compressor holder in its extreme lowermost position,beginning to press the sand around the socket of the tube, and the otherhalf section showing the tubular compressor holderl pressing the sandaround the body of tube. Fig. 2 is a cross sectional plan ol' the frame,the tubular compressor holder and the l model on A B Fig. l. Figs. 3 and4 are liront and side elevations of a compressor hinged on the tubularcompressor holder with its hinges, spring and screw shaped under facewhich is raised in front. Fig. 5 is a cross .mounted on a vertical corebox wherein the lantern is centered, the half section on the lett showsthe tubular compressor holder in its extreme lowermost position, theother hall section shows the tubular compressor holder having alreadypressed part ol the core. Fig. Gis a cross sectional plan through thecore box, the tubular compressor holder and the lantern on C D Fig. 5.Figs. 7 and 8 are l'ront and side elevations of a compressor rigidlyconnected to the tubular compressor holder, its screw shaped under facebeing raised in front. Fig. 9 is a cross sectional elevation of theunder part oil the sand hopper, feeding openings, valves and means lorautomatically opening the feeding apertures. Fig. l() is a crosssectional plan showing the feeding openings, valves and means forautomatically opening the feeding apertures. Fig. 11 is a crosssectional elevation ol a core box of reduced length hanging at the lowerend of the tubular compressor holder and receiving the same risingmovement. Fig. 12 is a cross sectional elevation ol a core box ofreduced length hanging at the lower end ol the tubular compressor'holder and receiving the same movement. Fig. 13 is a cross sectionalelevation oi the lower part ol a frame with a model of reduced lengthconnected to the tubular compressor holder by means of a crown engaginga circular groove. Fig. 14 is a cross section al elevation of the lowerpart of a iframe with a model of reduced length connected to the tubularcompressor holder. Fig. 15 is a cross sectional elevation ol'l a corebox showing a tubo surrounding the lantern and provided with a screwshaped compressor.

As shown in the drawings,the device consists of a frame l mounted on aeasing 2 or core box 3. The upper end ol'l said frame carries the lowerpart 4 of a ball bearing 5, which carries the upper part 5 thereol'fixed on a sleeve 7. Said sleeve 7 is guided in frame 1 by a downwardtubular extension 8. The frame l and sleeve 7 are longitudinallyconnected together by a ring 9 lixed on the upper end ol trame l. On thesleeve 7 is iixed a toothed crown 10 engaging with a pinion ll actuatedby an electric motor 12 sectional elevation showing the apparatus ceasescarried on a bracket 13 of frame 1. The sleeve 7 bears another upwardtubular extension 14 o'l' sullicient height to guide the tubularcompressor holder' and hold it in a vertical position during themolding. Said tubular prolongation 14 constitutes the inner wall oil thesand hopper whereon spindles 15 are Ylixed. rllhe outer wall 16 of saidhopper is iixed on posts 177 18 'forming part oi' frame 1. The sleeve 7constitutes the bottom o'll said sand hopper and is provided withfeeding openings 19. Said openings can be closed by a circular valve 2()bearing notches 21 and a handle 22. 0n post 17 is mounted on a stud 23an abutment 24 to automatically open the feeding openings on startingthe apparatus. A linger 25 on sleeve 7 rotates the abutment 24 when thei'ecding openings are opened to the required extent.'

ln the sleeve and in its tubular extension 14 are longitudinal grooves26 engaged by a longitudinal rib 27 on the tubular compressor holder 2S.@n the lower end ol said tubular compressor holder 23 are mountedarticulated compressors 29, rigid compressors 30 or a screw as shown inllig. 15. rlhe compressors 29 are pivoted to the tubular compressorholder to allow oi molding around the projecting parts ol'l models orcores (as sleeves, rims oi' tubes) without being obliged to increase thethickness or" sand on the body part o'lA the mold at those places; theyare pivoted on studs 31 in the hinges 32 connected to the compressorholders. A spring presses them always by their spherical boss againstthe wall ol' the casing or core box. Compressor 30 is rigidly mounted onsaid tubular compressor holder for molds or cores with uniform section.The screw on Fig. 15 is rigidly mounted at the lower end oi vthe tubularcompressor holder lor molds or cores with uniform section. The underi'aces oi' compressors 2Q and 3() are screw shaped and raised at theiriront ends to rise easily on the sand. They are curved according to theouter face o1" models and lanterns. Said apparatus are movable or 'lixedrespectively when the frame or core boxes are movable or iixed. lneither case, to prepare a mold or a core the 'lrame 1 is iixed on theeasing or core box wherein the model or lantern is already centered. Thetubular compressor holder is lowered until the compressors rest on thebottom oi the mold or ol' the core box.

rllhe hopper contains sand and the feeding openings are closed. rheabutment 24 is in the position shown in full lines Figs. Q and 10. Themotor is started. The toothed crown 10 is rotated horizontally togetherwith the sleeve 7 forming part therewith. The tubular compressor holderis rotated therewith by the longitudinal rib 27 engaging the groove 2Goi' the sleeve. The inner wall olA the hopper and its bottom providedwith 'feeding openings also revolve with the compressor holder. Theouter wall 16 ol` the hopper does not revolve. 0n starting the handle 22ol' valve 2O engages the pivoted abutment 24, the valve stops until thelinger 25 lil'ts said abutment 24, which trips and comes into theposition shown in punctuated line Figs. 9 and 10. At this moment thenotches 21 oi' the valve come in iront ol' the Yfeeding openings 19which are discoveredto the required extent and the valve begins again torevolve with the bottom olx he hopper. As soon as the openings areuncovered the sand stirred by the spindles 15 is distributed in the moldor in the core box continuously and during the revolution ol' thecompressors which press it by their screw shaped under 'lace as itl'alls bel'ore them. The tubular compressor holder 23 rises along the'lixed model or lantern by means oi the screw shaped umleri'aces ol' thecompressors and slides in the sleeve 7 and its tubular extension 14.l'fhen the mold or core is finished, the motor is stopped and thefeeding openings closed.

To prepare molds it is sometimes preferred in some particular instancesto use a model of reduced length receiving only a rising movement likethe compressors or both rising and revolving movements.

ln Fig. 13 the model 41 is of reduced length. lt is hung at the lowerpart of the tubular compressor holder by means of a crown 42 engaging agroove The model of reduced length is centered at the upper part in thesocket model 44, it rises with the tubular compressor holder. Thecompressors are pivoted at the lower end of the tubular compressorholder to press the sand around the socket model.

ln Fig. 14 the model 41 is of reduced length. lt is mounted on saidtubular compresser holder. rhe model of reduced length is centered inthe socket model, revolves and rises with the tubular compressor holder.The compressors are pivoted on the lower end of the tubular compressorholder. To prepare cores it is preferred in some particular instances7in order to prepare a small number of articles having the same diameter,to use core boxes of reduced length receiving only the upward movementof compressors or both their upward and revolving movements.

ln Fig. 11 the core box 35 is of reduced length. It is hung at the lowerpart of the tubular compressor holder by means of lugs 36 and iscentered on a fixed base 37. The box does not revolve with thecompressors but is moved vertically thereby. lt is guided by a casing 3Swhich also carries sand under the compressors.

in Fig. 12 the reduced core box 39 forms part of the tubular compressorholder, it revolves and rises therewith, guided by easing 40 whichcarries sand under the Compressors.

In Figs. 11 and l2 the upper part of the apparatus is the same as inFigs. 1, 5, 9 and 10.

Without departing from the scope of this invention sand molds or ooresmay be prepared by leaving tubular Compressor holders and sleeve fixedand by rotating the easing or oore box with the frame and the outer Wallof the sand hopper.

Claims l. In a device for the preparation of molds for Cylindricalcastings, in combination, a frame, a model a tubular compressor holder,compressors mounted on the holder, a sand hopper surrounding the tubularcompressor holder, a slidable connection between the hopper andcompressor holder, stirring spindles on one Wall of the hopper and thebottom of which hopper is provided with feeding openings, and means tohorizontally rotate one of the hopper Walls.

2. In a device for the preparation of sand molds for cylindricalcastings, the combination with a core box and a core, of a verticallymovable compressor holder, compressors pivotally mounted on the end ofthe holder and means to urge the compressors against the core box,whereby said oompressors automatically accommodate themselves to varyingdiameters of the mold.

3. In a deviee for the preparation of sand molds for cylindrical andsimilar Castings, the Combination with a core boX, a frame mountedthereon and a core, of a sand hopper having an outer stationary wall onsaid l'rame and an inner revoluble wall and a bottom movable with saidinner wall having sand feed openings therein, a valve to oontrol saidopenings, a Compressor holder oonneeted to and longitudinally slidablewith respeot to the inner wall ofthe hopper and surrounding the core,compressors mounted on the end of the holder, means to rotate the innerhopper wall and means to automatioally control the valve by the movementof said inner wall.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

MARIE JOSEPH PIGNARRE.

Witnesses:

GEORGES VANDER HAUGHEN, MAURICE BENOIT.

